Vin Diesel has 50 million Facebook friends, which to put into context, is just a few million shy of social media's crown prince, Justin Bieber. To celebrate, Mr Diesel has kindly shared with us, his Facepals, a behind-the-scenes clip of Fast & Furious 7's gruelling training regimen shared by himself and new franchise addition Tony Jaa. If it seems almost specifically designed to make us feel bad for letting our horizontal pull-ups slip, that's because it is.

Diesel, who seems to be starring and running the movie's PR drive at the same time, has added the Muay Thai specialist to the ranks of Fast 7's badass drag-racing outlaws. Jaa bent elephants to his will in Ong Bak; this time he'll helping Toretto (Diesel) and Brian O'Conner (Paul Walker) deal with a malevolent Jason Statham, avenging brother of Owen Shaw from Fast 6.

With Diesel, Walker, Russell Statham and Ludacris all aboard, the cast also includes Michelle Rodriguez, Jordana Brewster, Kurt Russell,Tyrese Gibson, Dwayne Johnson, Lucas Black and Djimon Hounsou. James Wan is beavering away on the film for a July 11 release in the US, while Fast & Furious 7 will wheelspin into our cinemas on July 25.